curl --request GET \
  --url https://api.givebutter.com/v1/messages/{message} \
  --header 'Authorization: Bearer <token>'

{
  "id": "<string>",
  "status": "<string>",
  "channel": "<string>",
  "internal_name": "<string>",
  "body": "<string>",
  "recipient_filters": "<string>",
  "recipient_count": "<string>",
  "sent_at": "<string>",
  "sending_at": "<string>",
  "created_at": "<string>",
  "updated_at": "<string>",
  "subject": "<string>"
}